Fan Noise Reduction using Acoustic Metamaterials towards Efficient Data Centers

Abstract

Unwanted sound from cooling fans has been a significant obstacle that limits the performance of data center Hard Disk Drive (HDD) storage systems. Acoustic metamaterials (AM) can be a solution to this problem. AM’s can be custom- designed to address specific tonal frequencies that the HDD’s are most vulnerable to. This paper focuses on using a 3D printed annular AM treatment that can be easily attached to the inlet or outlet of an axial fan. Initial design optimization was conducted using the Finite Element Method. Final 3D printed AM geometry was tested experimentally with a fan that is commonly used in a data center storage system. Results indicate a 10.8 dB noise reduction at the targeted tone and a significant reduction in its harmonics.